VELOCITY OF REACTION. HOMOGENEOUS SYSTEMS 91 



widely from the observed ones, probably because of the 

 spontaneous destruction of the trypsin. 



DESTRUCTION OF COLI-AGGLUTININ (i c.c.) BY TRYPSIN (5 c.c. i % SOL.) 

 AT DIFFERENT TEMPERATURES 



The method used for measuring the potency, i.e. the 

 inverse value of the quantity ^ Ob8 necessary for the pro- 

 duction of a certain degree of agglutination, is that 

 described by Madsen and Jorgensen. 1 From the observa- 

 tions the values K are calculated, by means of which the 

 calculated values for the potency are deduced according 

 to the formula for bimolecular reactions. The agreement 

 with the observed values is satisfactory. From the two 

 values at 33.5 and 44.2 C. the value p= 14,200 is calcu- 

 lated by means of the general formula. With this value 

 of fM we find 1 0^=70 at 37.2 C. in satisfactory agree- 

 ment with the observed value 75. 



A peculiar regularity is found for the coagulating power 

 of fibrin ferment on plasma. Here the product of time 

 of reaction and concentration is not nearly constant, as 

 in the coagulation of milk by rennet, but the product of 



1 Fcstskriftvtdlndvidscn afStatcns Serum Institut, Copenhagen, 1902, No. 5. 



